HTML controls do not retain state across post backs.
Example :-
WebForm1.aspx :-
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm4.aspx.cs" Inherits="FirstApplication.WebForm4" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
ASP.NET Server Control :<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<br />
<br />
HTML Control :
<input id="Text1" type="text"/><br />
<br />
<br />
<asp:Button ID="Button1" runat="server" Text="Button" />
</div>
</form>
</body>
</html>
An HTML control can be converted in ASP.NET server control by adding runat=”server” attribute in the HTML source.
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